Wrench.



A. FAGER.

WRE1\mH.v lAPPLIUATION FILED JAN. 7. 1911.

Patented Apr. 25, 1911.

www M if yll UNITED STATES PATENT OFFICE.

ADOLF FAGER, OF MADERA, PENNSYLVANIA.

WRENCH.

To all whom it may concern.

Be it known that I, ADoLF FAGER, a citizen of the United States,residing at Madera, in the county of Clearfield and State ofPennsylvania, have invented new and useful Improvements in Wrenches, ofwhich the following is a specification.

This invention relates to wrenches and more particularly to the typewhich is known in the art as monkey wrenches.

The object of the invention is the provision of a device of thischaracter employing a sliding jaw which may be readily moved upon theshank into adjusted engagement with the nut to be operated upon andautomatically locked in such position, the locking mechanism acting insuch a manner that as the pressure exerted to turn the nut increases thegripping force of the locking mechanism is also increased.

Further objects of the invention will appear as the following specificdescription is read in connection with the accompanying drawings whichform a part of this application and in which Figure 1 is a sideelevation. Fig. 2 is a longitudinal section therethrough. Fig. 3 is asection taken on the line 3-3 of Fig. 1. Fig. 11 is a section taken onthe line 4 -4 of Fig. l.

Referring more particularly to the draw ing 1 represents the shank ofthe device upon which is formed the stationary jaw 2. The opposite endof the shank 1 has secured thereto the handle members 3 in such a mannerthat they may be readily removed so as to disconnect the sliding jaw 4from the shank when it is necessary to make repairs. The sliding jaw 4comprises a yoke-shaped casting which has the separate legs 5 and 6thereof transversely apertured to receive the shank l. The yoke portionbetween the separate legs is provided with recesses 7 and intermediatethe recesses is a pivoting web 8 which is straddled by the pivoting ears9 of the locking dog 10. This locking dog is provided with a transverseaperture 11 which receives the shank 1 and which is of such dimensionsas to permit the dog to tilt upon its pivoting ear against the tensionof a spiral spring 12, arranged between the under side of the doo andthe upper side of the leg 6 and being hezld by inherent resiliency inthe sockets formed in the dog and leg.

The rear edge of the shank 1 is provided Specification of LettersPatent.

Application filed January 7, 1911.

Patented Apr. 25, 1911.

Serial No. 601,303.

throughout a port-ion of its length with a raised rack or ratchetsurface 13 which is engaged by a tooth 14 formed on the rear wall of theaperture 11. When the sliding jaw is moved toward the stationary jaw 2it will be noticed that the dog 10 will rise idly over the rack surface13, the spring 12 giving to permit such movement. The opposite movementof the jaw l, however, without manipulation of the dog 10 will result inthe positive engagement of the tooth 14 with the rack surface 13, theopposite wall of the aperture therethrough having a projecting lug orrib 15 which engages the opposite side ofthe shank diagonally across theshank from the tooth 14 so as to cause a binding action. Depressing thedog against the tension of the spring 12 will cause the disengagement ofthe tooth 14C from the rack surface 13 so that the jaw f1 may be readilymoved away from the jaw 2.

This device is designed particularly to provide a quick-acting wrenchwhich may be conveniently adjusted to the size of the nut to be operatedupon and which will automatically lock the sliding jaw in adjustedposition, and is further designed to obviate the diflicultiesencountered in providing a loose locking pawl whiqch is held in positionby a pivoted yoke, for in these devices it is necessary to move the yokeby hand when it is desired to lock the pawl and to also move the same byhand when it is desired to release the pawl so that the jaw can bemoved. It will be noticed that as pressure is exerted to tighten the nutor to loosen the same, and the jaw 1 consequently forced away from vthejaw 2 that the locking dog 10 with its positive engagement with the racksurface 18 will be drawn toward the leg 5 of the sliding jaw on accountof its pivotal connection with said jaw and thereby increase its holdingcapacity in proportion to the strain exerted upon the jaw.

I claim In combination, a shank having a ratchet surface and astationary jaw thereon, of a yoke-shaped sliding jaw freely mounted toslide upon the shank, a locking dog surrounding the shank and pivotallymounted between the legs of the yoke-shaped sliding jaw, a ratchet toothupon said locking dog adapted to ride idly over the rack surface of theshank in one direction of movement, a lug carried by the dog and adaptedto engage the shank to cause a bumping action in Inl testimony whereof Iaiixl my signatureV the opposite direction of movement, and in presenceof two Witnesses. means arranged between the locking dov, and one of thelegs of the sliding `jaw fo ADOLF FAGER' 5 normally holding the racksurface on said Yl/Viisnesses:

jaw in engagement With the rack surface on Y, A E. G. MILES,

the Shank. Y Y JAMES SHARP.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

